First slide

voltmeter

Question

An ammeter and a voltmeter are connected in series to a battery of emf 6.0 volt. When a certain resistance is connected in parallel with the voltmeter, the reading of the voltmeter decreases two times whereas the reading of the ammeter increases the same number of times. Find the voltmeter reading after the connection of the resistance :

Moderate

A

1 V
B

2 V
C

3 V
D

4 V

Solution

In first case, $V = 6 - i R$
[Resistance of ammeter R]
In second case, $\frac{V}{2} = 6 - (2 i) R$
$∵ V = 4 volt but \frac{V}{2} = 2 Volt$

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